Hi I solved this issue by performing two encoding steps:
1. Encode the 16-bit/48KHz source to 8-bit/8KHz G.711a format (my voicemail system is using G.711a) 2. Encode the 8-bit/8KHz G.711a format to required 16-bit/8KHz signed WAV format for SIPXecs Strange but glad I managed to work around this issue. Regards Justin On Sat, May 8, 2010 at 10:24 AM, Justin Menga <[email protected]>wrote: > Hi > > Yes I've followed that - 16-bit Microsoft PCM WAV format etc. My original > source prompts that were @ 8KHz did require reconversion to work on SIPXecs > and they are fine. It is just the ones that were originally @ 48KHz that > have the problem. All of the source prompts are professionally recorded > prompts that have no background noise. > > I've tried the highest quality settings on Adobe Audition, turned off > dithering, etc etc but to no avail. > > The strange thing is that the prompts sound fine on a softphone, but not on > a telephone or when you reconstruct them through a wireshark capture. > > Regards > Justin > > > On Fri, May 7, 2010 at 11:56 PM, Tony Graziano < > [email protected]> wrote: > >> Look at the AA prompt upload page. It tells you how these need to be >> sampled >> and formatted. >> ============================ >> Tony Graziano, Manager >> Telephone: 434.984.8430 >> Fax: 434.984.8431 >> >> Email: [email protected] >> >> LAN/Telephony/Security and Control Systems Helpdesk: >> Telephone: 434.984.8426 >> Fax: 434.984.8427 >> >> Helpdesk Contract Customers: >> http://www.myitdepartment.net/gethelp/ >> >> ----- Original Message ----- >> From: [email protected] >> <[email protected]> >> To: [email protected] <[email protected]> >> Sent: Fri May 07 07:52:24 2010 >> Subject: [sipx-users] Static in Custom Voicemail Prompts >> >> Hi >> >> I have converted a number of custom voicemail prompts for use in SIPXecs >> 4.0.4 >> >> Some of the source prompts were in a 48KHz sample rate format - hence I >> resampled these to 8KHz. I have noticed that with the resampled prompts, >> I >> can hear static when the prompts are played via telephone. I have >> verified >> this is not a handset issue as a Wireshark reconstruction of the RTP media >> stream from the voicemail server sounds the same. >> >> I have tried resampling using sox and Adobe Audition, with a number of >> different settings, but with no success. >> >> Any ideas? >> >> Regards >> Justin >> > >
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